GETFSSTAT(2) BSD System Calls Manual GETFSSTAT(2)NAMEgetfsstat — get list of all mounted file systems
SYNOPSIS
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
int
getfsstat(struct statfs *buf, long bufsize, int flags);
DESCRIPTIONGetfsstat() returns information about all mounted file systems. Buf is a
pointer to an array of statfs structures defined as follows:
typedef struct { int32_t val[2]; } fsid_t;
#define MFSNAMELEN 15 /* length of fs type name, not inc. nul */
#define MNAMELEN 90 /* length of buffer for returned name */
struct statfs {
short f_otype; /* type of file system (reserved: zero) */
short f_oflags; /* copy of mount flags (reserved: zero) */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id (super-user only) */
uid_t f_owner; /* user that mounted the file system */
short f_reserved1; /* reserved for future use */
short f_type; /* type of file system (reserved) */
long f_flags; /* copy of mount flags (reserved) */
long f_reserved2[2]; /* reserved for future use */
char f_fstypename[MFSNAMELEN]; /* fs type name */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted file system */
char f_reserved3; /* reserved for future use */
long f_reserved4[4]; /* reserved for future use */
};
Fields that are undefined for a particular file system are set to -1.
The buffer is filled with an array of statfs structures, one for each
mounted file system up to the size specified by bufsize.
If buf is given as NULL, getfsstat() returns just the number of mounted
file systems.
Normally flags should be specified as MNT_WAIT. If flags is set to
MNT_NOWAIT, getfsstat() will return the information it has available
without requesting an update from each file system. Thus, some of the
information will be out of date, but getfsstat() will not block waiting
for information from a file system that is unable to respond.
RETURN VALUES
Upon successful completion, the number of statfs structures is returned.
Otherwise, -1 is returned and the global variable errno is set to indi‐
cate the error.
ERRORSGetfsstat() fails if one or more of the following are true:
[EFAULT] Buf points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to
the file system.
SEE ALSOstatfs(2), fstab(5), mount(8)HISTORY
The getfsstat() function first appeared in 4.4BSD.
BSD June 9, 1993 BSD